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angle attached automatic stop backup blank burrs blank opening blanking punch bored bottom broaches bushing clamp clearance hole cold-rolled steel dowel holes drill rod drive fit E. G. MARSHALL edge extrusion finished flat hardened and ground heel insert jig borer knockout pins layout locating pins locator plate lower end lower member machine steel metal milled mounted mounted pierce movable member nest plate notch operation piece pierce and blank piercers piercing holes piercing punch pilot pins planish blocks press is tripped pressure ring prevent punch holder punch N punch plate punch press radii radius retaining plate right-angle form rod and hardened screwed and doweled sections shape shear shedder shoulder screws shown in Fig side slot snug-sliding fit steel and hardened stock advance stock guide stock thickness straight strip subpress surface swaging taper templet trimmed universal holder upper member water-hardening tool steel wear-resisting width